"Sun, 01 Feb 1970 12:33:48"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700201
Only TIME
12:33:48
General datetime
1970-02-01 12:33:48Z
For Database
1970-02-01 12:33:48
For HTTP1.1
Sun, 01 Feb 1970 12:33:48 GMT